feat: enable BLOCKS-only stream mode support

[petreze]

Description:
Adds full support for running the consensus node with blockStream.streamMode=BLOCKS, where only block stream files are produced — no legacy V6 record files. This PR does not change the production default; it switches the default in test configuration to validate that all code paths work correctly when streamMode=BLOCKS is eventually enabled in production.
Test config changes: streamMode=BLOCKS, writerMode=FILE, streamWrappedRecordBlocks=false

Production Changes

• Smart contract handlers: Guard legacy method calls with streamMode != BLOCKS, using block-native alternatives (addInitcode, addActions, addContractSlotUsages)
• TransactionExecutors: Reads streamMode from config; HandleOutput.singleTransactionRecords() provides unified List<SingleTransactionRecord> via BlockRecordSource.precomputedRecords() in BLOCKS mode
• QueryContextImpl: Sources block info from BlockStreamInfo state in BLOCKS mode instead of the unmaintained legacy BlockInfo singleton
• StreamValidationOp: Skips record stream file validation in BLOCKS mode

Test Infrastructure

• Unified streamMust* DSL verbs replace recordStreamMust* and blockStreamMust* — dynamically route to record or block stream based on streamMode via StreamAssertion marker interface
• RecordStreamToBlockAssertionAdapter: Translates block items to RecordStreamItem for existing validators; lenient mode suppresses translation-fidelity errors in no-failures assertions
• SidecarWatcher.forSpec(): Factory method auto-selects V6 sidecar files or block-derived sidecars based on streamMode
• EventualStreamAssertion: Supports replay, stop-after-first-success, and timeout propagation across both stream paths
  Test Changes

All recordStreamMust* and blockStreamMust* usages migrated to streamMust* across ~20 test files
12 new BLOCKS-mode unit tests verify block-native code paths
Existing unit tests that verify legacy behavior explicitly set streamMode=BOTH in config
Removed overriding("blockStream.streamMode", "BOTH") calls from subprocess tests — these corrupt the shared network config without affecting the cached HandleWorkflow.streamMode
WrappedRecordHashesFlagUpgradeSubprocessTest skips in BLOCKS mode (WRB requires record stream)

Related issue(s):

Fixes #25646

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[trunk-io]

Merging to main in this repository is managed by Trunk.

• To merge this pull request, check the box to the left or comment /trunk merge below.

After your PR is submitted to the merge queue, this comment will be automatically updated with its status. If the PR fails, failure details will also be posted here

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[github-actions]

Node: HAPI Test (Misc) Results

  157 files  ± 0      1 errors  156 suites   - 1   1h 13m 14s ⏱️ - 11m 0s
  174 tests  -  1    172 ✅  -  1  2 💤 ±0  0 ❌ ±0 
1 168 runs   - 38  1 166 ✅  - 38  2 💤 ±0  0 ❌ ±0 

For more details on these parsing errors, see this check.

Results for commit 69b5b6a. ± Comparison against base commit f3f6ed6.

This pull request removes 1 test.

com.hedera.services.bdd.suites.contract.leaky.LeakyContractTestsSuite ‑ as written

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 43.47826% with 26 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...era/node/app/records/impl/BlockStreamInfoImpl.java	0.00%	14 Missing ⚠️
...edera/node/app/blocks/impl/BlockStreamBuilder.java	0.00%	5 Missing ⚠️
...era/node/app/workflows/query/QueryContextImpl.java	0.00%	4 Missing ⚠️
...hedera/node/app/workflows/handle/HandleOutput.java	33.33%	1 Missing and 1 partial ⚠️
.../node/app/state/recordcache/BlockRecordSource.java	92.30%	0 Missing and 1 partial ⚠️

@@             Coverage Diff              @@
##               main   #25612      +/-   ##
============================================
- Coverage     75.11%   74.84%   -0.27%     
- Complexity    11548    11553       +5     
============================================
  Files          2585     2586       +1     
  Lines        101419   101455      +36     
  Branches      11241    11245       +4     
============================================
- Hits          76179    75938     -241     
- Misses        21335    21616     +281     
+ Partials       3905     3901       -4     

Files with missing lines	Coverage Δ	Complexity Δ
...app/workflows/standalone/TransactionExecutors.java	85.82% <100.00%> (+0.34%)	0.00 <0.00> (ø)
...com/hedera/node/config/data/BlockStreamConfig.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
.../node/app/state/recordcache/BlockRecordSource.java	98.11% <92.30%> (-1.89%)	0.00 <0.00> (ø)
...hedera/node/app/workflows/handle/HandleOutput.java	20.45% <33.33%> (+0.94%)	0.00 <0.00> (ø)
...era/node/app/workflows/query/QueryContextImpl.java	70.96% <0.00%> (-7.61%)	0.00 <0.00> (ø)
...edera/node/app/blocks/impl/BlockStreamBuilder.java	80.07% <0.00%> (+2.95%)	0.00 <0.00> (ø)
...era/node/app/records/impl/BlockStreamInfoImpl.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)

... and 26 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[testlens-app]

✅ All tests passed ✅

🏷️ Commit: 69b5b6a
▶️ Tests: 7068 executed
⚪️ Checks: 45/45 completed

---

Learn more about TestLens at testlens.app.